If you shop in full line shops and choose colors from one manufacturers line and blenders, that's one way to make sure your colors work together.
When in doubt, call and ask! Many of us small shop owners will take plenty of time to answer questions, help with color coordination, and even send you samples if you are unsure. If we are unsure of what you're after, we may offer to send you several samples for you to choose the one that works for you. Small owners depend on repeat business -- we want you to be totally satisfied with your purchases.